Telecom Square has counters at most of all international airport in Japan. They provide prepaid SIM card and portable WiFi. one of their SIM has voice call.
Even those who do not have an address in Japan can purchase online.
Due to covid-19, the number of companies offering Prepaid SIMs for travelers and short-stay visitors to Japan has decreased. Due to the declining demand for prepaid SIM cards, the prices and services of prepaid SIM cards have been changing. The demand for Prepaid SIM cards has also been affected by the decline in demand, and the products have changed.
For a more information about Telecom Square - Prepaid SIM Card Plans